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. 2015 Jul;11(7):740-56.
doi: 10.1016/j.jalz.2015.05.002.

Magnetic resonance imaging in Alzheimer's Disease Neuroimaging Initiative 2

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Magnetic resonance imaging in Alzheimer's Disease Neuroimaging Initiative 2

Clifford R Jack Jr et al. Alzheimers Dement. 2015 Jul.

Abstract

Introduction: Alzheimer's Disease Neuroimaging Initiative (ADNI) is now in its 10th year. The primary objective of the magnetic resonance imaging (MRI) core of ADNI has been to improve methods for clinical trials in Alzheimer's disease (AD) and related disorders.

Methods: We review the contributions of the MRI core from present and past cycles of ADNI (ADNI-1, -Grand Opportunity and -2). We also review plans for the future-ADNI-3.

Results: Contributions of the MRI core include creating standardized acquisition protocols and quality control methods; examining the effect of technical features of image acquisition and analysis on outcome metrics; deriving sample size estimates for future trials based on those outcomes; and piloting the potential utility of MR perfusion, diffusion, and functional connectivity measures in multicenter clinical trials.

Discussion: Over the past decade the MRI core of ADNI has fulfilled its mandate of improving methods for clinical trials in AD and will continue to do so in the future.

Keywords: ADNI; Alzheimer's Disease Neuroimaging Initiative; Alzheimer's disease; Diffusion; MRI; Neuroimaging; Perfusion; Resting functional MRI.

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Figures

Figure 1
Figure 1. Tensor based morphometry
This figure, adapted from Hua et al. [25] shows how tensor-based morphometry (TBM) can visualize the profiles of brain tissue loss and expansion, throughout the brain, in this case over a 12-month interval. These average maps of brain tissue loss for different diagnostic groups can be summarized to produce single “numeric summaries” of atrophy rates, as a percentage per year. Brain regions offering greatest group discrimination included the temporal lobes (shown in blue), or specially defined regions within them.
Figure 2
Figure 2. Boundary Shift Integral
Coronal, volumetric (3D) T1-weighted MRI scans from the same individual scanned at baseline and after an interval are shown. The second scan is aligned (spatially registered) to the first. Atrophy occurring between the two scans results in a shift at the brain/CSF interface (green overlay on third image). The boundary shift integral (BSI), the sum of the displacement of the brain/CSF boundary across the whole brain, provides a means of quantifying atrophy occurring between the two scans.

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References

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